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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | H9 | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Aroldis Chapman | 5.84 | 2010-2030 | |
| 2 | Javier Covarrubias* | 6.07 | 2061-2077 | |
| 3 | Jon Hoch | 6.23 | 2076-2091 | |
| 4 | Tony Soto# | 6.27 | 2088-2098 | |
| 5 | Jose Rubio* | 6.30 | 2060-2079 | |
| 6 | Juan Castorena | 6.44 | 2053-2070 | |
| 7 | Jason Hudgins# | 6.45 | 2092-2098 | |
| 8 | Cody Allen | 6.48 | 2012-2029 | |
| 9 | Nolan Ryan* | 6.56 | 1966-1993 | |
| 10 | Juan Fernandez* | 6.59 | 2053-2066 | |
| 11 | Matt Gilman* | 6.72 | 2051-2071 | |
| 12 | Akeel Morris | 6.75 | 2015-2030 | |
| 13 | Kenley Jansen | 6.76 | 2010-2026 | |
| 13 | Ray Carpenter | 6.76 | 2047-2060 | |
| 15 | Sandy Koufax* | 6.79 | 1955-1966 | |
| 16 | Sid Fernandez | 6.85 | 1983-1997 | |
| 17 | J.R. Richard | 6.88 | 1971-1980 | |
| 17 | Jesus Godinez | 6.88 | 2056-2063 | |
| 19 | Rich Mathieu | 6.90 | 2065-2077 | |
| 20 | Francisco Rodriguez | 6.91 | 2002-2019 | |
| 21 | Sean Lebron | 6.92 | 2061-2073 | |
| 22 | Andy Messersmith | 6.94 | 1968-1979 | |
| 23 | Dan White | 6.95 | 2077-2091 | |
| 24 | Starlin Cordero | 6.96 | 2021-2038 | |
| 24 | Rich Robichaud | 6.96 | 2031-2046 | |
| 24 | Jason Williams# | 6.96 | 2093-2098 | |
| 27 | Ken Giles | 6.97 | 2014-2030 | |
| 28 | Trevor Hoffman | 6.99 | 1993-2010 | |
| 29 | Mariano Rivera* | 7.00 | 1995-2013 | |
| 30 | Hoyt Wilhelm* | 7.01 | 1952-1972 | |
| 30 | Nick Cerqueira | 7.01 | 2055-2066 | |
| 32 | Chris Flores | 7.02 | 2060-2071 | |
| 32 | George Zimmerman | 7.02 | 2052-2065 | |
| 34 | Sam McDowell | 7.03 | 1961-1975 | |
| 35 | Liu-chun Cui* | 7.05 | 2038-2053 | |
| 36 | Kerry Wood | 7.06 | 1998-2012 | |
| 37 | Pedro Martinez* | 7.07 | 1992-2009 | |
| 38 | Alfredo Ceja | 7.09 | 2040-2055 | |
| 39 | Leo Monrreal* | 7.10 | 2031-2044 | |
| 40 | Keith Lau | 7.11 | 2035-2051 | |
| 41 | Victor Diaz | 7.12 | 2020-2032 | |
| 41 | Ed Walsh* | 7.12 | 1904-1917 | |
| 43 | Joe Wood | 7.13 | 1908-1922 | |
| 44 | Chris Hafer# | 7.14 | 2091-2098 | |
| 44 | Steve Scruggs | 7.14 | 2080-2094 | |
| 46 | Sean Sherman | 7.15 | 2082-2097 | |
| 47 | Yunior Perez* | 7.17 | 2021-2037 | |
| 47 | Jeremy LeVan | 7.17 | 2053-2064 | |
| 49 | Babe Ruth* | 7.18 | 1914-1935 | |
| 49 | Ed Reulbach | 7.18 | 1905-1917 | |
| 49 | Bob Turley | 7.18 | 1951-1963 | |
| 49 | Joel Peterson | 7.18 | 2059-2071 | |
| 49 | Ismael Macias | 7.18 | 2030-2048 | |
| 54 | Dan Howery | 7.19 | 2034-2051 | |
| 54 | Danny Aristondo | 7.19 | 2026-2038 | |
| 56 | Braxton Janke | 7.20 | 2046-2060 | |
| 57 | Brian Jones | 7.21 | 2061-2075 | |
| 57 | Carlos Rojas | 7.21 | 2026-2035 | |
| 57 | Paul Tate | 7.21 | 2052-2062 | |
| 60 | Orval Overall | 7.22 | 1905-1913 | |
| 61 | Jeff Tesreau | 7.24 | 1912-1918 | |
| 61 | Don McMahon | 7.24 | 1957-1974 | |
| 61 | Jeff Welsh | 7.24 | 2054-2066 | |
| 61 | Chris Lawler | 7.24 | 2050-2060 | |
| 61 | Chris Clark | 7.24 | 2072-2086 | |
| 66 | Dave Boswell | 7.25 | 1964-1971 | |
| 67 | Mario Soto | 7.26 | 1977-1988 | |
| 67 | Jake Pappas | 7.26 | 2023-2042 | |
| 67 | Evan Parker* | 7.26 | 2070-2086 | |
| 70 | Danny Avery | 7.28 | 2054-2069 | |
| 70 | Randy Johnson* | 7.28 | 1988-2009 | |
| 72 | Vincent Velasquez | 7.29 | 2015-2023 | |
| 72 | Rafael Campos | 7.29 | 2049-2058 | |
| 74 | Jose Benitez# | 7.30 | 2087-2098 | |
| 74 | Austin Priester | 7.30 | 2031-2045 | |
| 74 | Addie Joss* | 7.30 | 1902-1910 | |
| 77 | Eric DeSanto | 7.32 | 2046-2061 | |
| 77 | Jorge Villalona# | 7.32 | 2090-2098 | |
| 79 | Jack Pfiester | 7.33 | 1903-1911 | |
| 79 | Alex Soto* | 7.33 | 2068-2087 | |
| 79 | Jesse Orosco | 7.33 | 1979-2003 | |
| 82 | Doug Hodges | 7.34 | 2078-2093 | |
| 83 | Cy Morgan | 7.35 | 1903-1913 | |
| 84 | Josh Lowe | 7.36 | 2033-2047 | |
| 85 | Jon Hartman | 7.38 | 2046-2062 | |
| 85 | Jose DeLeon | 7.38 | 1983-1995 | |
| 85 | Kilber Santana | 7.38 | 2020-2040 | |
| 88 | Jim Maloney | 7.39 | 1960-1971 | |
| 89 | Mario Segura* | 7.40 | 2060-2080 | |
| 89 | Pete Richert | 7.40 | 1962-1974 | |
| 91 | Colby Brown | 7.41 | 2057-2068 | |
| 92 | Rick Foley | 7.42 | 2064-2079 | |
| 92 | Scott Gaimari | 7.42 | 2080-2094 | |
| 94 | Clayton Kershaw* | 7.44 | 2008-2029 | |
| 94 | Mike Jackson | 7.44 | 1986-2004 | |
| 96 | Rich Gossage* | 7.45 | 1972-1994 | |
| 96 | Rube Waddell* | 7.45 | 1900-1910 | |
| 96 | Jose Madrigal | 7.45 | 2057-2071 | |
| 99 | Tom Seaver* | 7.47 | 1967-1986 | |
| 100 | Walter Johnson* | 7.48 | 1907-1927 |
